Force dilly-dallies with cool admiral's vessel (8)
I believe the answer is:
flagship
'admiral's vessel' is the definition.
(I've seen this before)
'force dilly-dallies with cool' is the wordplay.
'force dilly' becomes 'f' (I am not sure about this - if you are sure you should believe this answer much more).
'dallies' becomes 'lags' (I've seen this in another clue).
'with' is a charade indicator (letters next to each other).
'cool' becomes 'hip' (hip can mean cool or fashionable).
'f'+'lags'+'hip'='FLAGSHIP'
Can you help me to learn more?
(Other definitions for flagship that I've seen before include "Something of the greatest importance (to an admiral?)" , "Admiral's craft in a fleet" , "leading product" , "finest specimen" , "Pre-eminent item" .)