Fleet see Heath maybe coming on board, thinking shrewdly (5-10)
I believe the answer is:
quick-wittedness
'thinking shrewdly' is the definition.
(thinking quickly or shrewdly)
'fleet see heath maybe coming on board' is the wordplay.
I cannot quite understand how this works, but
'see' could be 'c' (the word for the letter, according to Chambers) and 'c' is found in the answer.
'heath' could be 'ted' (Ted Heath the former British Prime Minister) and 'ted' is found in the answer.
'maybe' could be 'i' (I've seen this in other clues) and 'i' is present in the answer.
'on board' could be 'ss' (I've seen this in other clues) and 'ss' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?