Father turned and concealed insect (5)
I believe the answer is:
aphid
'insect' is the definition.
(aphid is a kind of insect)
'father turned and concealed' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'turned' is a reversal indicator.
'and' means one lot of letters go next to another.
'concealed' becomes 'hid' ('hide' can be a synonym of 'conceal').
'pa' in reverse letter order is 'ap'.
'ap'+'hid'='APHID'
(Other definitions for aphid that I've seen before include "Sap-sucking bug" , "Plant-louse" , "Small insect like greenfly" , "Blackfly or greenfly" , "Garden pest" .)