I caught seabird moving round Arctic feature (7)
I believe the answer is:
iceberg
'arctic feature' is the definition.
(I've seen this before)
'i caught seabird moving round' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'seabird' becomes 'grebe' (grebe is a kind of seabird).
'moving round' is a reversal indicator.
'grebe' in reverse letter order is 'eberg'.
'i'+'c'+'eberg'='ICEBERG'
(Other definitions for iceberg that I've seen before include "calf, perhaps" , "Broken piece of a glacier" , "Kind of lettuce" , "Floating shipping hazard" , "(Frozen?) type of lettuce" .)