Material for which ordinary seaman wins award? (8)
I believe the answer is:
asbestos
'material' is the definition.
(asbestos is a kind of material)
'ordinary seaman wins award?' is the wordplay.
I cannot quite understand how this works, but
'ordinary' could be 'o' (abbreviation e.g. O-Levels) and 'o' is located in the answer.
'wins' could be 'bests' (I've seen this in another clue) and 'bests' is located in the leftover letters.
The remaining letters 'as' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'for which' is the link.
(Other definitions for asbestos that I've seen before include "dangerous dust" , "Heat-resistant material" , "Survivor of heat" , "Fire-resistant material, a danger to health" , "Fire-resistant material, injurious to health" .)