Two creatures left inside being obvious (7)
I believe the answer is:
blatant
'obvious' is the definition.
(I've seen this in another clue)
'two creatures left inside' is the wordplay.
'two creatures' can mean two replacements for 'creature'.
'creature' becomes 'bat' (bat is a kind of creature).
'creature' becomes 'ant'.
'left' becomes 'L' (common abbreviation).
'inside' indicates putting letters inside.
'bat'+'ant'='batant'
'batant' placed around 'l' is 'BLATANT'.
'being' acts as a link.
(Other definitions for blatant that I've seen before include "Very obvious and without shame" , "Totally obvious" , "Offensively obtrusive" , "Far from subtle" , "Without any attempt at concealment" .)