A group covering bit of Something and Help! (5)
I believe the answer is:
asset
'help' is the definition.
(an asset can be a help)
'a group covering bit of something' is the wordplay.
'group' becomes 'set' (set is a kind of group**).
'covering' means one lot of letters goes inside another.
'bit of' indicates taking the first letters.
The first letter of 'something' is 's'.
'set' placed around 's' is 'sset'.
'a'+'sset'='ASSET'
'and' is the link.
(Other definitions for asset that I've seen before include "Seats (anag.)" , "Anything considered valuable" , "One bringing benefit" , "Strong point" , "valuable sort" .)