Fearful of time being shortened by one day (5)
I believe the answer is:
timid
'fearful' is the definition.
(associated in meaning)
'time being shortened by one day' is the wordplay.
'being shortened' means to remove the last letter.
'by' says to put letters next to each other.
'one' becomes 'i' (Roman numeral).
'day' becomes 'd' (abbreviation for day).
'time' with its last letter taken off is 'tim'.
'tim'+'i'+'d'='TIMID'
'of' is the link.
(Other definitions for timid that I've seen before include "Lacking in courage" , "Shrinking" , "not forward" , "Bashful or fearful" , "Lacking in confidence" .)