Think about dime wasted at gallery (8)
I believe the answer is:
meditate
'think' is the definition.
(I know that meditate is a more specific form of the action the think)
'dime wasted at gallery' is the wordplay.
'wasted' indicates anagramming the letters.
'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 "Think intently and at length" , "Muse" , "Think deeply and quietly" , "Spend time in thought" , "Reflect upon" .)