Crossword Genius

Raise one northern fold (8)

Ross

I believe the answer is:

increase

'raise' is the definition.
(thesaurus)

'one northern fold' is the wordplay.
'one' becomes 'i' (Roman numeral).
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'fold' becomes 'crease' ('crease' can be a synonym of 'fold'**).
'i'+'n'+'crease'='INCREASE'

(Other definitions for increase that I've seen before include "Become greater in number" , "Addition, growth" , "Become bigger or greater in amount" , "Make (amount) greater" , "Make larger in a sincere way" .)

I've seen this clue in The Telegraph.
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