Dad drops bottles very loudly, getting flammable substance (8)

I believe the answer is:

paraffin

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'flammable substance' is the definition.
'paraffin' can be an answer for 'substance' (paraffin is a kind of substance). I'm not certain of the 'flammable' bit.

'dad drops bottles very loudly' is the wordplay.
'dad' becomes 'pa' (synonyms).
'drops' becomes 'rain' (drops of water).
'bottles' means one lot of letters goes inside another (bottle can mean to contain).
'very loudly' becomes 'ff' (short for fortissimo, 'very loud' in music).
'rain' going around 'ff' is 'raffin'.
'pa'+'raffin'='PARAFFIN'

'getting' acts as a link.

Can you help me to learn more?

(Other definitions for paraffin that I've seen before include "Liquid fuel" , "Waxy flammable substance" , "Kerosene" , "Petroleum product" , "Flammable wax" .)

I've seen this clue in The Times.

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