Beneath the elbow, maybe (5)
I believe the answer is:
'beneath' is the definition.
('below' can be a synonym of 'beneath')
'the elbow maybe' is the wordplay.
'maybe' is an anagram indicator.
'elbow' anagrammed gives 'BELOW'.
(Other definitions for below that I've seen before include "Underneath" , "Not worthy of" , "Subordinate to" , "in one's cabin" , "Feel miserable" .)