Geordie's about to shelter deer (3)
I believe the answer is:
roe
'deer' is the definition.
(I've seen this before)
'geordie's about to shelter' is the wordplay.
'to shelter' indicates a hidden word.
'about' is a reversal indicator.
'eor' can be found hidden inside 'geordies'.
'eor' back-to-front is 'ROE'.
(Other definitions for roe that I've seen before include "If hard, eggs" , "Food from fish" , "Part of fish, sounds like go through water" , "shy animal" , "Caviar" .)