Dream island belonging to me with silver in it? (7)
I believe the answer is:
imagine
'dream' is the definition.
(thesaurus)
'island belonging to me with silver in it?' is the wordplay.
'island' becomes 'i'.
'belonging to me' becomes 'mine' (I've seen this before).
'with' means one lot of letters go next to another.
'silver' becomes 'ag' (Ag is the chemical symbol for silver).
'in it?' indicates putting letters inside.
'i'+'mine'='imine'
'imine' going around 'ag' is 'IMAGINE'.
(Other definitions for imagine that I've seen before include "that Lennon composed" , "Lennon song - dream" , "Conceive; fancy" , "Picture in mind, envisage" , "Assume" .)