Looking at some money in gamble (5)
I believe the answer is:
eying
'looking at' is the definition.
(I've seen this before)
'some money in gamble' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'EYING' can be found hidden inside 'money in gamble'.
(Other definitions for eying that I've seen before include "Fixated on" , "In the process of close scrutiny" , "Looking at closely" , "Observing" , "Ogling," .)