These perhaps disturbed eelgrass catching prey finally (4,5)
I believe the answer is:
grey seals
'these' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'disturbed eelgrass catching prey finally' is the wordplay.
'disturbed' indicates an anagram (the order of letters is disturbed).
'catching' is an insertion indicator.
'finally' suggests the final letters.
The final letter of 'prey' is 'y'.
'eelgrass' with letters rearranged gives 'greseals'.
'greseals' enclosing 'y' is 'GREY SEALS'.
'perhaps' is the link.
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