Attentive husband required to go topless (7)
I believe the answer is:
heedful
'attentive' is the definition.
(similar in meaning)
'husband required to go topless' is the wordplay.
'husband' becomes 'h'.
'required' becomes 'needful' (synonyms).
'to go topless' means to remove the first letter.
'needful' with its initial letter removed is 'eedful'.
'h'+'eedful'='HEEDFUL'
(Other definitions for heedful that I've seen before include "Wary" , "Attentive - circumspect" , "Cautious" , "Paying careful attention" , "Prudent" .)