Could boy be touring Northern Ireland, say? (6)
I believe the answer is:
island
'ireland say?' is the definition.
(I know that Ireland is a island)
'could boy be touring northern' is the wordplay.
'could' becomes 'is' (I am not sure about this - if you are sure you should believe this answer much more).
'boy' becomes 'lad' (informal term for boy).
'be touring' means one lot of letters goes inside another (tour can mean to go around).
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'lad' enclosing 'n' is 'land'.
'is'+'land'='ISLAND'
Can you help me to learn more?
(Other definitions for island that I've seen before include "Man, for example" , "Ireland, Britain, Cyprus say" , "eg Man, Wight" , "Lewis and Harris, possibly" , "See 7" .)