Some icebergs around water bird (5)
I believe the answer is:
grebe
'water bird' is the definition.
(I've seen this before)
'some icebergs around' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'around' shows that the letters should be reversed in order.
'eberg' is hidden in the letters of 'icebergs'.
'eberg' back-to-front is 'GREBE'.
(Other definitions for grebe that I've seen before include "Diving bird which may be crested" , "Diver" , "Duck-sized water-bird" , "Small bird that builds floating nests" , "Diving water bird" .)