Enduring bachelor involved in giving help (7)
I believe the answer is:
abiding
'enduring' is the definition.
('abiding' can be a synonym of 'enduring')
'bachelor involved in giving help' is the wordplay.
'bachelor' becomes 'b' (abbreviation e.g. BA=Bachelor of Arts).
'involved in' means one lot of letters goes inside another.
'giving help' becomes 'aiding' (I've seen this before).
'b' placed inside 'aiding' is 'ABIDING'.
(Other definitions for abiding that I've seen before include "With a lasting quality" , "Durable, lasting" , "Enduring - constant" , "Putting up with: long-lasting" , "firm" .)