Looked ahead having begun to go back (5)
I believe the answer is:
ogled
'looked ahead' is the definition.
'ogled' can be an answer for 'looked' (ogling is a kind of looking). I am not sure about the 'ahead' bit.
'begun to go back' is the wordplay.
'begun to' becomes 'del' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'back' shows that the letters should be reversed in order.
'del'+'go'='delgo'
'delgo' reversed gives 'OGLED'.
'having' is the link.
Can you help me to learn more?
(Other definitions for ogled that I've seen before include "Eyed lecherously" , "Looked flirtatiously at" , "Longingly looked at" , "Looked at lecherously" , "regarded with desire" .)