Crossword Genius

Most unlikely to try being entirely inclusive? (7)

Ross

I believe the answer is:

tallest

I'm a little stuck... Click here to teach me more about this clue!

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

'try being entirely inclusive?' is the wordplay.
I cannot really see how this works, but
'entirely' could be 'all' (all can mean entirely or completely) and 'all' is found within the answer.
'try' could be 'test' (synonyms) and 'test' is found in the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...

'to' acts as a link.

Can you help me to learn more?

(Other definitions for tallest that I've seen before include "most exaggerated" , "most unlikely" , "Sell tat (anag.)" , "Top out" , "Most high" .)

I've seen this clue in The Times.
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