Crossword Genius

Muse tends to confuse — it's inevitable (5,4)

Ross

I believe the answer is:

needs must

'inevitable' is the definition.
(I've seen this before)

'muse tends to confuse' is the wordplay.
'to confuse' indicates an anagram.
'muse'+'tends'='musetends'
'musetends' is an anagram of 'NEEDS MUST'.

'it's' is the link.

(Other definitions for needs must that I've seen before include "It's inevitable" , "Of necessity" , "It is necessary" , "what wine-making does" , "Perforce" .)

I've seen this clue in The Guardian.
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