Inflammation that's going a little blue (7)
I believe the answer is:
whitlow
'inflammation' is the definition.
(I have seen 'Inflammation of finger ' mean 'whitlow' so perhaps 'inflammation' could also mean 'whitlow')
'little blue' is the wordplay.
'little' becomes 'whit' (I've seen this before).
'blue' becomes 'low' (I've seen this in another clue).
'whit'+'low'='WHITLOW'
'that's going a' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for whitlow that I've seen before include "Painful inflammation beside nail" , "Small abscess under a nail" , "gathering" , "Inflammation of finger(tip)" , "Abscess near a nail" .)