Crossword Genius

Again advanced smaller sum to head, showing persistence (14)

Ross

I believe the answer is:

relentlessness

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Here is my best explanation:

'persistence' is the definition.
(thesaurus)

'again advanced smaller sum to head' is the wordplay.
'again' becomes 're'.
'advanced' becomes 'lent' (money).
'smaller sum' becomes 'less'.
'to head' becomes 'ness' (ness is a headland).
're'+'lent'+'less'+'ness'='RELENTLESSNESS'

'showing' is the link.

Ross

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(Another definition for relentlessness that I've seen is "show persistence".)

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