Fine fabric in reddish-yellow (5)
I believe the answer is:
flame
'reddish-yellow' is the definition.
I can't judge whether this defines the answer.
'fine fabric' is the wordplay.
'fine' becomes 'f' (abbreviation in pencil classifications).
'fabric' becomes 'lame' (lame is a kind of fabric).
'f'+'lame'='FLAME'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for flame that I've seen before include "Orange-red; set alight" , "Glowing part of fire" , "Ignited gas" , "Evidence of fire" , "abusive comment" .)