Dictionary publisher's change involving a couple of lines (7)
I believe the answer is:
collins
'dictionary publisher's change involving a couple of lines' is the definition.
I can't tell whether this definition defines the answer.
'change involving a couple of lines' is the wordplay.
'change' becomes 'coins' (I've seen this in another clue).
'involving' means one lot of letters goes inside another.
'a couple of lines' becomes 'll' (two abbreviations for line).
'coins' enclosing 'll' is 'COLLINS'.
Can you help me to learn more?
(Other definitions for collins that I've seen before include "Tom --- (cocktail)" , "Wilkie ---, novelist; Mr ---, fancied Eliza Bennet" , "Iced cocktail" , "Harper --, UK publisher" , "Wilkie --, English author (The Moonstone)" .)