Stars mostly remember coming back to cheers (7)

'stars' is the definition.
(I've seen this before)

'mostly remember coming back to cheers' is the wordplay.
'mostly' means to remove the last letter (most but not all of the word).
'remember' becomes 'recall' (to recall something is to remember it).
'coming back' shows that the letters should be reversed in order.
'to cheers' becomes 'ta' (both can informally mean thank you).
'recall' with its last letter removed is 'recal'.
'recal' written backwards gives 'lacer'.
'lacer'+'ta'='LACERTA'