Expression of disapproval about hot blanket (5-3)

I believe the answer is:

catch-all

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'expression of disapproval' is the definition.
The definition suggests a singular noun which matches the answer.

'about hot blanket' is the wordplay.
'about' is an insertion indicator.
'hot' becomes 'h' (abbreviation eg on taps).
'blanket' becomes 'catcall' (I am not sure about this - if you are sure you should believe this answer much more).
'h' placed inside 'catcall' is 'CATCH-ALL'.

Can you help me to learn more?

(Other definitions for catch-all that I've seen before include "Covering a variety of instances" , "Something encompassing all possibilities" , "dealing with everything" , "Comprehensive" , "Covering lots of eventualities" .)

I've seen this clue in The Times.

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