May unfortunately see can contains rejected mushroom starch component (11)
I believe the answer is:
amylopectin
'rejected mushroom starch component' is the definition.
I know nothing about this answer so I can't tell whether this works.
'may unfortunately see can' is the wordplay.
'unfortunately' indicates anagramming the letters (a bad or unfortunate spelling).
'see' becomes 'lo' (archaic exclamation meaning 'look!').
'can' becomes 'pectin' (I am not sure about this - if you are sure you should believe this answer much more).
'may' anagrammed gives 'amy'.
'amy'+'lo'+'pectin'='AMYLOPECTIN'
'contains' is the link.
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