From the old dialectal verb clit + -y (adjectival suffix).
Meanings
(UK, dialectal, obsolete) Poorly or imperfectly set (of bread, cement, soil after rain, etc)
I'm vexed tha keaks be clitty. 1867, William Frederick Rock, Jim (fict.name.), Jim and Nell: A Dramatic Poem in the Dialect of North Devon, pages 29-30:
The snow seemed to club the land, which got ‘clitty’ and worked badly for a considerable time afterwards. 1897 January 30th, Evesham Journal, quoted in the EDD
This yur pudden's proper clitty, sure 'nough - I zim tis 'most like putty.[…] 1875, Frederick Thomas Elworthy, The Dialect of West Somerset: A Paper Read Before the Philological Society, January 15, 1875, page 141: