Depend entirely? Only half (4)

I believe the answer is:

rely

'depend' is the definition.
(thesaurus)

'entirely? only half' is the wordplay.
'only half' means to take half the letters.
'entirely' cut in half is 'RELY'.

(Other definitions for rely that I've seen before include "Trust, depend" , "Depend confidently (on)" , "Be sure" , "Be dependent" , "All the letters" .)

I've seen this clue in The Times.

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