Give a point to clever men without marks (7)
I believe the answer is:
sharpen
'give a point to' is the definition.
(give something a sharp point)
'clever men without marks' is the wordplay.
'clever' becomes 'sharp' (I've seen this in another clue).
'without' suggests deleting specific letters.
'marks' becomes 'M' (former German currency).
'men' with 'm' taken away is 'en'.
'sharp'+'en'='SHARPEN'
(Other definitions for sharpen that I've seen before include "Put a point on" , "Whet" , "Raise pitch of" , "Make more acute" , "instrument secured by former nurse" .)