A leading bed-maker? (4,8)

I believe the answer is:

head gardener

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'a leading bed-maker?' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'leading bed-maker?' is the wordplay.
'leading' becomes 'head' (I've seen this in other clues).
'bed maker?' becomes 'gardener' (I can't justify this - if you can you should believe this answer much more).
'head'+'gardener'='HEAD GARDENER'

Can you help me to learn more?

I've seen this clue in The Irish News.

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