Man following retired woman’s turn of phrase (5)
I believe the answer is:
idiom
'turn of phrase' is the definition.
(I've seen this before)
'man following retired woman's' is the wordplay.
'man' becomes 'iom' (Abbreviation for the Isle of Man).
'following' means one lot of letters go next to another.
'retired' is a reversal indicator.
'woman' becomes 'di' (short for Diana).
'di' backwards is 'id'.
'iom' put after 'id' is 'IDIOM'.
(Other definitions for idiom that I've seen before include "'Break a leg' or 'miss the boat'" , "Peculiar term" , "Colloquialism" , "Characteristic style, vocabulary" , "Special turn of phrase" .)