Say to the chaps to turn it over (7)
I believe the answer is:
mention
'say' is the definition.
(mentioning is a kind of saying)
'the chaps to turn it over' is the wordplay.
'the chaps' becomes 'men' (I've seen this before).
'to turn' shows that the letters should be reversed in order.
'over' becomes 'on' (I've seen this in other clues**).
'it' written backwards gives 'ti'.
'men'+'ti'+'on'='MENTION'
'to' acts as a link.
(Other definitions for mention that I've seen before include "Make reference to" , "Acknowledge" , "Cite; quote" , "Speak of - refer to" , "Briefly refer to (something)" .)