Deliveries left for one on periods without work (3,6)
I believe the answer is:
leg breaks
'deliveries' is the definition.
(I've seen this before)
'left for one on periods without work' is the wordplay.
'left for one' becomes 'leg' (left leg).
'on' means one lot of letters go next to another.
'periods without work' becomes 'breaks' (breaks from work).
'leg'+'breaks'='LEG-BREAKS'
(Other definitions for leg breaks that I've seen before include "Spinner's deliveries" , "Cricket balls" .)