He roars uncontrollably, becoming this? (7)

I believe the answer is:

hoarser

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'this?' is the definition.
The answer and definition are not the same part of speech.

'he roars uncontrollably' is the wordplay.
'uncontrollably' indicates anagramming the letters (I've seen this in other clues).
'he'+'roars'='heroars'
'heroars' with letters rearranged gives 'HOARSER'.

'becoming' is the link.

Can you help me to learn more?

(Other definitions for hoarser that I've seen before include "More husky" , "Rougher-sounding" .)

I've seen this clue in The Guardian.

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