Be right over an amphibian that is deprived (6)
I believe the answer is:
bereft
'is deprived' is the definition.
(I've seen this in another clue)
'be right over an amphibian' is the wordplay.
'right' indicates one should take the final letters (I've seen 'right of' mean this (letter on the rightmost end of the word)).
'an amphibian' becomes 'eft' (eft is a kind of amphibian).
The last letter of 'over' is 'r'.
'be'+'r'+'eft'='BEREFT'
'that' is the link.
(Other definitions for bereft that I've seen before include "Deprived, perhaps of reason (6)" , "Having a deep sense of loss" , "Lonely and abandoned" , "Pained by the loss of someone" , "Deprived, of reason or loved one" .)