Doddering eccentric, pierced and tattooed (head only) (8)
I believe the answer is:
decrepit
'doddering' is the definition.
(I've seen this before)
'eccentric pierced and tattooed head only' is the wordplay.
'eccentric' indicates an anagram.
'and' is a charade indicator (letters next to each other).
'head only' indicates taking the first letters (only the head of the word).
The first letter of 'tattooed' is 't'.
'pierced' with letters rearranged gives 'decrepi'.
'decrepi'+'t'='DECREPIT'
(Other definitions for decrepit that I've seen before include "Pet cried (anag) - worn out" , "Frail and creaky" , "Getting on" , "Run-down by old age or hard use" , "Feeble - dilapidated" .)