Dependent may see trouble returning during split (7)
I believe the answer is:
reliant
'dependent' is the definition.
(thesaurus)
'trouble returning during split' is the wordplay.
'trouble' becomes 'ail' ('ail' can be a synonym of 'trouble').
'returning' is a reversal indicator.
'during' means one lot of letters goes inside another.
'split' becomes 'rent' ('rent' can be a synonym of 'split'**).
'ail' in reverse letter order is 'lia'.
'lia' inserted within 'rent' is 'RELIANT'.
'may see' is the link.
(Other definitions for reliant that I've seen before include "Dependent (on someone or something)" , "Depending on another for support" , "in need of assistance" , "Dependent - latrine (anag)" , "Dependent upon" .)