Small, small person excited to cheat (6,2)
I believe the answer is:
stitch up
'cheat' is the definition.
(to stitch someone up is to cheat them)
'small small person excited' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'small person' becomes 'titch' (titch can informally mean a short person).
'excited' becomes 'up'.
's'+'titch'+'up'='STITCH-UP'
'to' is the link.
(Other definitions for stitch up that I've seen before include "frame" , "Unfairly organised situation" , "Fix (situation) to someone's advantage (colloq.)" , "Swindle - incriminate - repair" , "Incriminate by unfair means" .)