Crossword Genius

Subject number falls within this range? (3,7)

Ross

I believe the answer is:

the mendips

'range?' is the definition.
(Mendip Hills)

'subject number falls' is the wordplay.
'subject' becomes 'theme' ('theme' can be a synonym of 'subject').
'number' becomes 'n'.
'falls' becomes 'dips'.
'theme'+'n'+'dips'='THE MENDIPS'

'within this' is the link.

(Another definition for the mendips that I've seen is " heights".)

I've seen this clue in The Guardian.
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