No, because if you do it on purpose then the entangler can be counted as an untethered projectile, thus forbidden.

Peter, the rules may not be entirely clear on all the aspects concerning cluster robots but the following points are important:
- no entangling devices - your part of the cluster that entangles the opponent can be seen as an entangling device
- no untethered projectiles - your part of the cluster that entangles the opponent can be seen as an untethered projectile
- no grappling - after a certain time (60 seconds ?) you must let your opponent go, failure in doing so will result in you losing the fight by default

The point is that all the parts of your cluster must be on the offensive, with the intent to attack, not with the intent to just hang on. By the way:hanging on does not generate more points for attack... it is a single action and the jury might consider the hanging part of the cluster immobilised. Do you really wish to imperil a third of your chances like that ???
Also, the aim is to immobilise your opponent by actively damaging it or scoring points by hitting it. What you intend to do is -in my humble opinion- bordering on the unsportive.