Tired of phoning endlessly (3,2)
I believe the answer is:
all in
'tired' is the definition.
(similar in meaning)
'phoning endlessly' is the wordplay.
'phoning' becomes 'calling' ('call' can be a synonym of 'phone').
'endlessly' says to take the centre (the ends of the words are removed).
The middle letters of 'calling' are 'ALL-IN'.
'of' is the link.
(Other definitions for all in that I've seen before include "price covering the lot" , "Exhausted - comprehensive" , "Inclusive; tired" , "Pooped" , "Quite exhausted - everyone at home" .)