Woody Allen's heart breaks seconds before turning blue (6)
I believe the answer is:
sylvan
'woody' is the definition.
(thesaurus)
'allen's heart breaks seconds before turning blue' is the wordplay.
'heart' says to take the centre.
'breaks' is an insertion indicator.
'seconds before' becomes 's' (I am not sure about the 'before' bit.).
'turning' shows that the letters should be reversed in order.
'blue' becomes 'navy' (shade of blue).
The middle letter of 'allen' is 'l'.
'navy' in reverse letter order is 'yvan'.
's'+'yvan'='syvan'
'l' going inside 'syvan' is 'SYLVAN'.
(Other definitions for sylvan that I've seen before include "Consisting of woods or forests" , "Of the woods or trees" , "Idyllically rural" , "Associated with woods" , "Of the woods, rural" .)