。
Wake me up at 7 tomorrow morning.
Literal
Tomorrow-morning 7-o'clock [at-に] wake-up give-favor.
くれ is the plain imperative of くれる ('give to me'). Combined with te-form, it makes a gruff or masculine request: 'do X for me.' More abrupt than ~てください but used by men to peers or subordinates. Typical of older-brother or boss speech.