A lock of hair gave Romeo a peculiar tingle. (7)
I believe the answer is:
ringlet
'a lock of hair' is the definition.
(I've seen this before)
'romeo a peculiar tingle' is the wordplay.
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'a peculiar' indicates an anagram (a peculiar or strange ordering of the letters).
'tingle' anagrammed gives 'inglet'.
'r'+'inglet'='RINGLET'
'gave' acts as a link.
(Other definitions for ringlet that I've seen before include "Curled lock of hair" , "Curl or tendril" , "Curl of hair; butterfly" , "Hair curl, of an Irish dancer perhaps" , "twist of sorts?" .)