Marine is fierce suppressing fear, oddly (9)

I believe the answer is:

seafaring

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'marine' is the definition.
(thesaurus)

'fierce suppressing fear oddly' is the wordplay.
'fierce' becomes 'searing' (I can't justify this - if you can you should give a lot more credence to this answer).
'suppressing' is an insertion indicator.
'oddly' indicates alternate letters (letters in the odd-numbered positions are used).
The alternate letters of 'fear' are 'fa'.
'searing' going around 'fa' is 'SEAFARING'.

'is' is the link.

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(Other definitions for seafaring that I've seen before include "So Jack's likely to be" , "ocean travel" , "Travelling by ship" , "Travelling the ocean" , "Just like Jack" .)

I've seen this clue in The Telegraph.

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