Crossword Genius

Most bitter requires little bit of money and relaxation (7)

Ross

I believe the answer is:

sourest

'most bitter' is the definition.
(bitter can mean sour)

'little bit of money and relaxation' is the wordplay.
'little bit of money' becomes 'sou' (historical French coin).
'and' means one lot of letters go next to another.
'relaxation' becomes 'rest' (synonyms).
'sou'+'rest'='SOUREST'

'requires' is the link.

(Another definition for sourest that I've seen is " Most unpleasant".)

I've seen this clue in The Telegraph.
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