Commonly ending up in solitary (4)

I believe the answer is:

only

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'solitary' is the definition.
('only' can be a synonym of 'solitary')

'commonly ending up' is the wordplay.
'ONLY' is hidden in amongst the letters.
But, I am uncertain how this is indicated.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for only that I've seen before include "Exclusive - individual" , "Unique; merely" , "And no one else" , "Single, solitary" , "Siblingless (child)" .)

I've seen this clue in the Evening Standard.

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