Bill blowing top on occasion with daughter? That’s inappropriate (3-5)
I believe the answer is:
ill-timed
'inappropriate' is the definition.
(synonyms)
'bill blowing top on occasion with daughter?' is the wordplay.
'blowing top' means to remove the first letter.
'on' is a charade indicator (letters next to each other).
'occasion' becomes 'time' (I've seen this in another clue).
'with' is a charade indicator (letters next to each other).
'daughter?' becomes 'd' (genealogical abbreviation).
'bill' with its initial letter removed is 'ill'.
'ill'+'time'+'d'='ILL-TIMED'
'that's' is the link.
(Other definitions for ill-timed that I've seen before include "Badly scheduled" , "Done or occurring at an inconvenient moment" , "Happening at a badly chosen moment" , "Inopportune" .)