Love husband taking down trousers (7)
I believe the answer is:
nothing
'love' is the definition.
(I've seen this before)
'husband taking down trousers' is the wordplay.
'husband' becomes 'h'.
'taking down' becomes 'noting' ('note' can be a synonym of 'take down').
'trousers' indicates putting letters inside (to trouser can mean to contain or hold).
'h' placed within 'noting' is 'NOTHING'.
(Other definitions for nothing that I've seen before include "'Zero, zilch (7)'" , "Not a whit" , "What's in a vacuum?" , "Not anything" , "Naught, nil, nix" .)