Think deeply about dime wasted at gallery (8)
I believe the answer is:
meditate
'think deeply' is the definition.
(I've seen this before)
'dime wasted at gallery' is the wordplay.
'wasted' indicates an anagram.
'at' means one lot of letters go next to another.
'gallery' becomes 'tate' (Tate Modern, Tate Britain etc).
'dime' with letters rearranged gives 'medi'.
'medi'+'tate'='MEDITATE'
'about' is the link.
(Other definitions for meditate that I've seen before include "Consider thoughtfully" , "Think contemplatively" , "Think intently and at length" , "brood" , "Engage in contemplation" .)