Idiots accommodating old lady gathers together (7)
I believe the answer is:
amasses
'gathers together' is the definition.
(I've seen this in another clue)
'idiots accommodating old lady' is the wordplay.
'idiots' becomes 'asses' (I've seen this before).
'accommodating' indicates putting letters inside.
'old lady' becomes 'ma' (both can mean mother).
'asses' enclosing 'ma' is 'AMASSES'.
(Other definitions for amasses that I've seen before include "'Accumulates, gathers (7)'" , "Gathers together" , "Collects" .)