noun
noun: fleet; plural noun: fleets; singular proper noun: Fleet; noun: the Fleet
1.
dialect
a marshland creek, channel, or ditch.
2.
a stream, now wholly underground, running into the Thames east of Fleet Street.
Thank you brendan and cerasus. I thought I was sure of the first and last letters. The F comes from Jalfrezi - clue - Hot Indian dish of meat or vegetables with chillies and spices. The T comes from 'Plastic covered frame for protecting plants outdoors' and I've got Polytunnel.