Junior bottled Spanish water for big cat (6)
I believe the answer is:
jaguar
'big cat' is the definition.
(I know that jaguar is a type of big cat)
'junior bottled spanish water' is the wordplay.
I cannot really see how this works, but
'spanish water' could be 'agua' (I've seen this in another clue) and 'agua' is present in the answer.
'junior' could be 'jr' (abbreviation) and 'jr' is found within the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...
'for' is the link.
Can you help me to learn more?
(Other definitions for jaguar that I've seen before include "Powerful cat" , "Wild American cat or fast car" , "Spotted feline and prestigious car" , "Panther's relative - driven on the road" , "Wild cat from S America, or fast car" .)