Lines of type or squiggles (6)
I believe the answer is:
poetry
'lines' is the definition.
(I've seen this before)
'type or squiggles' is the wordplay.
'squiggles' indicates anagramming the letters.
'type'+'or'='typeor'
'typeor' anagrammed gives 'POETRY'.
'of' is the link.
(Other definitions for poetry that I've seen before include "'Best words in best order' (Coleridge)" , "Verse" , "Literary art" , "Metrical writing" , "Literary genre" .)