Crossword Genius

The last thing to give you warts? (5)

Ross

I believe the answer is:

straw

I'm a little stuck... Click here to teach me more about this clue!

'the last thing' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'give you warts?' is the wordplay.
'warts' can be anagrammed to 'STRAW'.
However, I am not clear how the anagram is indicated.

'to' is the link.

Can you help me to learn more?

(Other definitions for straw that I've seen before include "Thin tube; yellow" , "Thatching material" , "Dried stalks; yellow" , "corny stuff" , "politician" .)

I've seen this clue in the Evening Standard.
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