Case that is recalled, involving you in Calais (4)
I believe the answer is:
etui
'case' is the definition.
(case for needlework equipment)
'recalled involving you in calais' is the wordplay.
'recalled' is a reversal indicator (to recall can mean to bring something back).
'involving' is an insertion indicator.
'you' becomes 'u' (commonly used in online communication).
'in calais' becomes 'ite' (I can't explain this - if you can you should believe this answer much more).
'u' placed inside 'ite' is 'iute'.
'iute' written backwards gives 'ETUI'.
'that is' is the link.
Can you help me to learn more?
(Other definitions for etui that I've seen before include "Small case for sewing accessories" , "Small case for small articles" , "Small French case" , "Case for holding sewing articles" , "Tiny ladies' bag" .)