Poem from man on love — depressingly lacking content (6)
I believe the answer is:
monody
'poem' is the definition.
(thesaurus)
'man on love depressingly lacking content' is the wordplay.
'man' becomes 'm'.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'lacking content' says to hollow out the word (remove centre letters) (the content of the word is emptied out).
'depressingly' with its middle taken out is 'dy'.
'm'+'on'+'o'+'dy'='MONODY'
'from' acts as a link.
(Other definitions for monody that I've seen before include "lament" , "Song that's mournful" , "musical style" , "elegy" , "Plainchant, perhaps" .)