Crossword Genius

Her companion admits a horse is laid out for Ascot? (6)

Ross

I believe the answer is:

haggis

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

'laid out for ascot?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'her companion admits a horse is' is the wordplay.
'her' becomes 'ag'.
'companion' becomes 'g' (I can't explain this - if you can you should believe this answer much more).
'admits' is an insertion indicator.
'a horse' becomes 'h' ('H' can be a synonym of 'horse').
'ag'+'g'='agg'
'h'+'is'='his'
'agg' inserted into 'his' is 'HAGGIS'.

Can you help me to learn more?

(Other definitions for haggis that I've seen before include "Scotish sheep dish" , "Burns' night dish" , "Scottish food" , "Dish served piping" , "Scotland's national dish" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.
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