With old English ex-PM touring, called for zest (6,4)
I believe the answer is:
orange peel
'zest' is the definition.
(I've seen this in another clue)
'with old english ex-pm touring called' is the wordplay.
'with' says to put letters next to each other.
'old english' becomes 'OE'.
'ex pm' becomes 'peel' (19th-century prime minister Robert Peel. I am not sure about the 'ex' bit.).
'touring' indicates putting letters inside (tour can mean to go around).
'called' becomes 'rang' (called on the phone).
'oe' next to 'peel' is 'oepeel'.
'oepeel' going around 'rang' is 'ORANGE-PEEL'.
'for' is the link.
Can you help me to learn more?
(Other definitions for orange peel that I've seen before include "Pithy stuff" , "Rind often candied" , "Bit of fruit" .)