Creatures around lake: its obvious (7)

I believe the answer is:

blatant

I'm a little stuck... Click here to teach me more about this clue!

'obvious' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for blatant that I've seen before include "Offensively obvious" , "Conspicuous" , "Offensively obtrusive" , "Far from subtle" , "Open; flagrant" .)

I've seen this clue in The Sun.

Want a hint initially instead of a full solution? Install my app