Crossword Genius

Tactful omissions by a straw weaver? (5)

Ross

I believe the answer is:

warts

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'tactful omissions' is the definition.
Although both the answer and definition are plural nouns, I don't understand how they can define each other.

'a straw weaver?' is the wordplay.
'straw' anagrams to 'WARTS'.
Though, I am not sure how this is indicated.

'by' is the link.

Can you help me to learn more?

(Other definitions for warts that I've seen before include "unwanted lumps" , "Skin growths" , "feature prominently on 12,14 across [UGLY SISTERS]" , "Verrucas" .)

I've seen this clue in the Evening Standard.
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