Singular repugnance for reactive element (6)
I believe the answer is:
sodium
'reactive element' is the definition.
'sodium' can be an answer for 'element' (sodium is a kind of element). I'm not sure about the 'reactive' bit.
'singular repugnance' is the wordplay.
'singular' becomes 's' (abbreviation sometimes used in dictionaries).
'repugnance' becomes 'odium' (I've seen this in another clue).
's'+'odium'='SODIUM'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for sodium that I've seen before include "... is its atomic number: symbol Na" , "Element in table salt" , "Common salt is ...... chloride" , "Soft reactive metal" , "Soft metal, symbol Na" .)