Crossword Genius

Make comfy quiet head office in province (9)

Ross

I believe the answer is:

upholster

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'make comfy' is the definition.
I can't judge whether this defines the answer.

'quiet head office in province' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'head office' becomes 'HO'.
'in' means one lot of letters goes inside another.
'province' becomes 'ulster' (I've seen this before).
'p'+'ho'='pho'
'pho' put inside 'ulster' is 'UPHOLSTER'.

Can you help me to learn more?

(Other definitions for upholster that I've seen before include "Stuff and cover chairs etc" , "Provide furniture with padding, springs etc" , "Furnish with padding" , "Cover furniture" , "Furnish seating" .)

I've seen this clue in The Times.
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