Energy-packed story adapted for silent type in bed? (6)
I believe the answer is:
oyster
'silent type in bed?' is the definition.
(proverbially silent creature of the sea bed)
'energy-packed story adapted' is the wordplay.
'energy' becomes 'e' (physics symbol as in E=mc2).
'packed' means one lot of letters goes inside another (some letters are packed into others).
'adapted' indicates an anagram.
'story' is an anagram of 'oystr'.
'e' placed into 'oystr' is 'OYSTER'.
'for' acts as a link.
(Other definitions for oyster that I've seen before include "aphrodisiac?" , "Storey (anag)" , "bit of chicken meat" , "Mollusc with shucks" , "Pearl-generating bivalve" .)