Requires bilge, so babbles (7)

I believe the answer is:

obliges

'requires' is the definition.

'bilge so babbles' is the wordplay.
'babbles' is an anagram indicator.
'bilge'+'so'='bilgeso'
'bilgeso' with letters rearranged gives 'OBLIGES'.

(Other definitions for obliges that I've seen before include "Forces" , "Compels" , "Accommodates" .)

I've seen this clue in The Everyman puzzle in The Observer.

Want a hint initially instead of a full solution? Install my app