Cheese is available in limited amounts (4)
I believe the answer is:
edam
'cheese' is the definition.
(Edam is an example)
'available in limited amounts' is the wordplay.
'available in' indicates the answer is hidden within the clue.
'EDAM' is hidden in the letters of 'limited amounts'.
'is' is the link.
(Other definitions for edam that I've seen before include "Dutch food" , "Cheese made in Holland" , "Made into popular cheese" , "Yellow cheese with a red covering" , "Made (anag) - Dutch cheese" .)