Crossword Genius

Reserve stableboy cheapest place in ground?

Ross

I believe the answer is:

standingroom

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

'cheapest place in ground?' is the definition.
I can't tell whether this defines the answer.

'reserve stableboy' is the wordplay.
'reserve' becomes 'standin' (I can't explain this - if you can you should believe this answer much more).
'stableboy' becomes 'groom' (synonyms).
'standin'+'groom'='STANDING-ROOM'

Can you help me to learn more?

(Another definition for standingroom that I've seen is " Limited accommodation".)

I've seen this clue in The Daily Mail.
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