Lecher, say, having to cut and run (5)
I believe the answer is:
satyr
'lecher' is the definition.
(synonyms)
'say having to cut and run' is the wordplay.
'having' means one lot of letters goes inside another.
'cut' means to remove the last letter.
'and' is a charade indicator (letters next to each other).
'run' becomes 'r' (cricket abbreviation).
'to' with its final letter removed is 't'.
'say' going around 't' is 'saty'.
'saty'+'r'='SATYR'
(Other definitions for satyr that I've seen before include "Goat-like woodland deity of Greek mythology" , "Goatish deity" , "lecher" , "Lustful men or woodland gods" , "Woodland deity - lustful man" .)