Let money relieve matters (5)

I believe the answer is:

lease

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'let' is the definition.
('lease' can be a synonym of 'let')

'money relieve matters' is the wordplay.
'money' becomes 'l' (L can mean 'pounds').
'relieve matters' becomes 'ease' (I can't justify this - if you can you should believe this answer much more).
'l'+'ease'='LEASE'

Can you help me to learn more?

(Other definitions for lease that I've seen before include "Letting contract" , "Contract of tenure" , "Let for money" , "Property rental agreement" , "Renting contract" .)

I've seen this clue in the Evening Standard.

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