One in charge of light drinker pocketing £1000 (7)
I believe the answer is:
skipper
'one in charge of light' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?
'drinker pocketing ps1000' is the wordplay.
'drinker' becomes 'sipper' (sipper is a kind of drinker).
'pocketing' means one lot of letters goes inside another (pocket can mean to steal or take possession of).
'psk000' becomes 'k' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sipper' enclosing 'k' is 'SKIPPER'.
Can you help me to learn more?
(Other definitions for skipper that I've seen before include "being in charge?" , "One who misses" , "Captain - one using a rope" , "who makes short hops" , "Chap aboard trawler" .)