Usually in BrE words like clear, fere, clear, mere, etc are pronounced with a diphthong comprising an open high front vowel followed by something resembling a schwa. However, they are sometimes pronounced as a true monophthong at a position somewhat intermediate to either.
I don not use this pronunciation myself and it seems quite alien: I cannot work out the register, nor does it seem obviously regional, nor associated with RP. It doesn't seem to be an artefact of fast speech. I find see any indication of it being historical (but such things are hard to determine for a casual researcher).
Can anyone provide information on the use of this monophthong?