Parents postponing employment of second hot water bottle? (7)
I believe the answer is:
thermos
'hot water bottle?' is the definition.
(container for keeping drinks hot)
'parents postponing employment of second' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is found within the answer.
'second' could be 's' (common abbreviation) and 's' is found in the answer.
The remaining letters 'therm' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for thermos that I've seen before include "Heat-retaining flask for mothers" , "Container to retain heat" , "Flask trade mark" , "Vacuum flask for mothers" .)