Colin is generating semiconductor (7)
I believe the answer is:
silicon
'semiconductor' is the definition.
(I've seen this before)
'colin is generating' is the wordplay.
'generating' is an anagram indicator.
'colin'+'is'='colinis'
'colinis' anagrammed gives 'SILICON'.
(Other definitions for silicon that I've seen before include "Electronic circuit element" , "Electronic material" , "Semi-conducting non-metal" , "Semiconducting element" , "Element used in electronic circuits" .)