Crossword Genius

Deliveryman to join with hat (4,6)

Ross

I believe the answer is:

seam bowler

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

'deliveryman' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'join with hat' is the wordplay.
'join with' becomes 'seam' (seaming is a kind of joining. I am not sure about the 'with' bit.).
'hat' becomes 'bowler' (bowler is a kind of hat).
'seam'+'bowler'='SEAM BOWLER'

'to' is the link.

Can you help me to learn more?

I've seen this clue in The Daily Express.
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