Tina's upset when Eric's naughty - and very quickly! (2,1,5)
I believe the answer is:
in a trice
'very quickly' is the definition.
(I've seen this before)
'tina's upset when eric's naughty' is the wordplay.
I cannot really see how this works, but
an anagram of 'eric' is 'rice' which is within the answer.
an anagram of 'tina' is 'inat' which is within the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'and' acts as a link.
Can you help me to learn more?
(Other definitions for in a trice that I've seen before include "quickly" , "Pronto" .)