Tall trio in action: it's a wrap (8)
I believe the answer is:
tortilla
'a wrap' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'tall trio in action' is the wordplay.
'in action' indicates anagramming the letters (I've seen this in other clues).
'tall'+'trio'='talltrio'
'talltrio' is an anagram of 'TORTILLA'.
'it's' acts as a link.
Can you help me to learn more?
(Other definitions for tortilla that I've seen before include "Mexican dish" , "Round flat Mexican cake" , "Mexican 7 across" , "Cake including maize" , "Littoral (anag.)" .)