Subordinate to shout half-heartedly (5)
I believe the answer is:
below
'subordinate to' is the definition.
(thesaurus)
'shout half-heartedly' is the wordplay.
'shout' becomes 'bellow' (bellow is a kind of shout).
'half' means to take half the letters.
'heartedly' becomes 'ow' (I've seen this in other clues).
'bellow' with half the letters taken is 'bel'.
'bel'+'ow'='BELOW'
(Other definitions for below that I've seen before include "Not worthy of" , "in one's cabin" , "Feel miserable" , "Underneath" , "Lower than" .)