Awful spitter who may offer advice at Ascot? (7)

I believe the answer is:

tipster

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'may offer advice at ascot?' is the definition.
I can't tell whether this defines the answer.

'awful spitter' is the wordplay.
'awful' indicates an anagram.
'spitter' with letters rearranged gives 'TIPSTER'.

'who' acts as a link.

Can you help me to learn more?

(Other definitions for tipster that I've seen before include "Gambling advisor" , "One with views on race" , "Seller of information on racecourse etc" , "Racing tout" , "Person who points out likely race winners" .)

I've seen this clue in The Times.

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