Navigator needing a cool head when the boat's upset (5)

I believe the answer is:

cabot

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'navigator' is the definition.
(I know that Cabot is a navigator)

'a cool head when the boat's upset' is the wordplay.
'a cool head when' becomes 'c' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'upset' is an anagram indicator.
'boat' is an anagram of 'abot'.
'c'+'abot'='CABOT'

'needing' acts as a link.

Can you help me to learn more?

(Other definitions for cabot that I've seen before include "famous explorer" , "John (Giovanni) -, navigator, explored N. America" , "Sebastian -, navigator" , "John (or Sebastian), Tudor explorer" , "Sebastian & John -, early navigators" .)

I've seen this clue in the Evening Standard.

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