Wrong to seal off hot waste receptacle (7)

I believe the answer is:

ashtray

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'waste receptacle' is the definition.
'ashtray' can be an answer for 'receptacle' (receptacle for cigarette ash). I'm not certain of the 'waste' bit.

'wrong to seal off hot' is the wordplay.
'wrong' becomes 'astray' (going astray is going wrong).
'to seal off' is an insertion indicator.
'hot' becomes 'h' (abbreviation eg on taps).
'astray' enclosing 'h' is 'ASHTRAY'.

Can you help me to learn more?

(Other definitions for ashtray that I've seen before include "Smoker's aid" , "Place for detritus from cigarettes, cigars etc" , "Dish for smokers" , "Where to rest cigarette" , "Smelly receptacle" .)

I've seen this clue in The Times.

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