Girl is leaving to get hold of cotton thread (5)
I believe the answer is:
lisle
'cotton thread' is the definition.
(I've seen this before)
'girl is leaving to get' is the wordplay.
'to get' indicates the answer is hidden within the clue (I've seen 'gets' mean this).
'LISLE' can be found hidden inside 'girl is leaving'.
'hold of' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for lisle that I've seen before include "Fine cotton thread used in stockings" , "Strong twisted cotton thread for the strange Ellis" , "Strong tightly twisted cotton thread" , "Pedestrianised city" , "Type of cotton yarn" .)