Reverse taxi into printer’s sign? Disaster! (7)
I believe the answer is:
debacle
'disaster' is the definition.
(synonyms)
'reverse taxi into printer's sign?' is the wordplay.
'reverse' is a reversal indicator.
'taxi' becomes 'cab' (synonyms).
'into' is an insertion indicator.
'printer's sign?' becomes 'dele' (sign meaning to delete in printing).
'cab' reversed gives 'bac'.
'bac' inserted within 'dele' is 'DEBACLE'.
(Other definitions for debacle that I've seen before include "Rout; fiasco" , "foul-up" , "Utter failure" , "Great disaster" , "A sound defeat" .)