Crossword Genius

It helps to keep a cool head - help them with it possibly (4,6)

Ross

I believe the answer is:

pith helmet

'it helps to keep a cool head' is the definition.
(type of hat that keeps the head cool)

'help them with it possibly' is the wordplay.
'with' says to put letters next to each other.
'possibly' indicates anagramming the letters.
'help'+'them'+'it'='helpthemit'
'helpthemit' is an anagram of 'PITH HELMET'.

(Another definition for pith helmet that I've seen is " sun-shield".)

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