Roughly ten diamonds to draw (6)
I believe the answer is:
entice
'draw' is the definition.
(thesaurus)
'roughly ten diamonds' is the wordplay.
'roughly' indicates an anagram.
'diamonds' becomes 'ice' (I've seen this before).
'ten' with letters rearranged gives 'ent'.
'ent'+'ice'='ENTICE'
'to' acts as a link.
(Other definitions for entice that I've seen before include "Persuade with promise of reward" , "how siren might operate?" , "Lure, beguile" , "Tempt, lead astray" , "Allure" .)