Cameroon is in her travels, whatever the circumstances (4,4,2,5)
I believe the answer is:
come rain or shine
'whatever the circumstances' is the definition.
(I've seen this before)
'cameroon is in her travels' is the wordplay.
'travels' indicates an anagram.
'cameroon'+'is'+'in'+'her'='cameroonisinher'
'cameroonisinher' is an anagram of 'COME RAIN OR SHINE'.
(Other definitions for come rain or shine that I've seen before include "regardless of circumstances" , "Whatever the weather" , "Whatever the circumstances" , "no matter what the circumstances may be" .)