Sticking up for a potato insect? (11)

I believe the answer is:

protuberant

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'sticking up for a potato insect?' is the definition.
I can't tell whether this defines the answer.

'for a potato insect?' is the wordplay.
'for' becomes 'pro' (as in being 'pro' or in favour of something).
'a potato' becomes 'tuber' (potato is an example of a tuber).
'insect?' becomes 'ant' (ant is a kind of insect).
'pro'+'tuber'+'ant'='PROTUBERANT'

Can you help me to learn more?

(Other definitions for protuberant that I've seen before include "Outstanding" , "Proud" , "Bulging" , "Sticking out" .)

I've seen this clue in The Globe and Mail.

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