Look to double your money as you laze (4)
I believe the answer is:
loll
'laze' is the definition.
(lolling is a kind of lazing)
'look to double your' is the wordplay.
'look' becomes 'lo' (archaic term meaning 'look!').
'to double' says to double the letters.
'your' becomes 'l' (I can't justify this - if you can you should give a lot more credence to this answer).
'l' duplicated is 'll'.
'lo'+'ll'='LOLL'
'money as you' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for loll that I've seen before include "Drop" , "Lean back in lazy and relaxed manner" , "Sprawl lazily" , "Lie lazily" , "Hang loosely; sit lazily" .)