English pub upset soldiers with endless beer only lasting one day (9)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

E (English) + PH (pub) + a reversal (upset) of REME (Royal Electrical and Mechanical Engineers – soldiers) + AL[e] A lovely poignant word, whose Greek derivation – epi hemera – means literally lasting for only one day – making a great surface here (I’m reminded of one of our local pubs, years ago, at an anniversary of the ending of WW2, offering beer at 1945 prices – but only in exchange for 1945 currency: my husband, an inveterate hoarder, had a sweetie jar full of half-crowns, bobs, tanners, threepenny bits, etc and he and my son-in-law had a great afternoon)