Hazard accepting a particular size (8)

I believe the answer is:

imperial

I'm a little stuck... Click here to teach me more about this clue!

'particular size' is the definition.
'imperial' can be an answer for 'size' (thesaurus). I am unsure of the 'particular' bit.

'hazard accepting a' is the wordplay.
'hazard' becomes 'imperil' (I've seen this before).
'accepting' is an insertion indicator (inserted letters are accepted).
'imperil' going around 'a' is 'IMPERIAL'.

Can you help me to learn more?

(Other definitions for imperial that I've seen before include "Majestic - not metric" , "Of UK weights and measures" , "measure" , "Like some rulers" , "Sovereign - old Russian gold coin - type of beard" .)

I've seen this clue in The Times.

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