Golden farthing provided small change for tithe (8)

I believe the answer is:

fiftieth

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'golden' is the definition.
Both the definition and answer are adjectives. Maybe you can see a link between them that I can't see?

'farthing provided small change for tithe' is the wordplay.
'farthing' becomes 'f' (abbreviation listed in Chambers).
'provided small' becomes 'if' (eg 'provided it's sunny' means 'if it's sunny'. I am not sure about the 'small' bit.).
'change for' indicates an anagram.
'tithe' is an anagram of 'tieth'.
'f'+'if'+'tieth'='FIFTIETH'

Can you help me to learn more?

(Other definitions for fiftieth that I've seen before include "This anniversary is golden" , "Gold anniversary" .)

I've seen this clue in The Independent.

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