Dealing and darting about (7)
I believe the answer is:
trading
'dealing' is the definition.
(I've seen this before)
'darting about' is the wordplay.
'about' indicates an anagram.
'darting' with letters rearranged gives 'TRADING'.
'and' is the link.
(Other definitions for trading that I've seen before include "Exchanging; a word used in the first ever 2 dn" , "Dealing" , "Buying and selling" , "in the marketplace" , "Commercial activity" .)