Crossword Genius

Returning it (the call) is wearisome (6)

Ross

I believe the answer is:

tiring

'wearisome' is the definition.
(thesaurus)

'returning it the call' is the wordplay.
'returning' is a reversal indicator.
'the call' becomes 'ring' (I've seen this before).
'it' in reverse letter order is 'ti'.
'ti'+'ring'='TIRING'

'is' is the link.

(Other definitions for tiring that I've seen before include "Boring" , "Causing weariness" , "Growing weary or bored" , "Wearisome" , "Becoming sleepy" .)

I've seen this clue in the Evening Standard.
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