Feel ill in middle of Biscay, unwilling to get material on board boat (9)

I believe the answer is:

sailcloth

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

'material on board boat' is the definition.
'sailcloth' can be an answer for 'material' (sailcloth is a kind of material). I'm unsure of the 'on board boat' bit.

'feel ill in middle of biscay unwilling' is the wordplay.
'feel ill' becomes 'ail' (I've seen this in another clue).
'in' means one lot of letters goes inside another.
'middle of' says to take the centre.
'unwilling' becomes 'loth' (similar in meaning).
The middle letters of 'biscay' are 'sc'.
'ail' placed into 'sc' is 'sailc'.
'sailc'+'loth'='SAILCLOTH'

'to get' acts as a link.

Can you help me to learn more?

(Other definitions for sailcloth that I've seen before include "fabric" , "I call host (anag) - canvas" .)

I've seen this clue in The Times.

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