Electrified track's beginning at Holyhead - bothered about length (8)
I believe the answer is:
thrilled
'electrified' is the definition.
Although both the answer and definition are past participle verbs, I cannot understand how they can define each other.
'track's beginning at holyhead bothered about length' is the wordplay.
'beginning' indicates taking the first letters.
'at' says to put letters next to each other.
'holyhead' becomes 'h' (head letter of 'holy').
'bothered about length' becomes 'rilled' (I am not sure about this - if you are sure you should believe this answer much more).
The initial letter of 'tracks' is 't'.
't'+'h'+'rilled'='THRILLED'
Can you help me to learn more?
(Other definitions for thrilled that I've seen before include "Excited and pleased" , "Exhilarated" , "Feeling intense pleasurable excitement" , "Delighted" .)