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Supportive material, strong (9)

Ross

I believe the answer is:

strapping

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This clue might be a double definition.

'supportive material' is the first definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

'strong' is the second definition.
(synonyms)

Can you help me to learn more?

(Other definitions for strapping that I've seen before include "Robust" , "Brawny" , "Burly" , "Tying up" , "stalwart" .)

I've seen this clue in The Times.
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