Blag boy's shift, every so often, and earn money while parents are away? (7)
I believe the answer is:
babysit
'earn money while parents are away?' is the definition.
I can't tell whether this definition defines the answer.
'blag boy's shift every so often' is the wordplay.
'every so often' means one should take alternating letters.
'blag'+'boys'+'shift'='blagboysshift'
The alternating letters of 'blagboysshift' are 'BABYSIT'.
'and' is the link.
Can you help me to learn more?
(Other definitions for babysit that I've seen before include "Take charge to allow parents to go out" , "Tend to kid" , "Supervise in loco parentis" , "Mind" , "Look after children temporarily" .)