Improve blending of metal and resin (10)
I believe the answer is:
streamline
'improve blending' is the definition.
I can't judge whether this defines the answer.
'of metal and resin' is the wordplay.
'of' indicates anagramming the letters (the answer comes from or 'of' the letters).
'and' is a charade indicator (letters next to each other).
'metal' after 'resin' is 'resinmetal'.
'resinmetal' is an anagram of 'STREAMLINE'.
Can you help me to learn more?
(Other definitions for streamline that I've seen before include "Get more efficient" , "Make (a body) less resistant to fluid flow" , "Increase efficiency" , "run things more efficiently" , "Improve efficiency" .)