Some or all of the cryptic part of a clue may involve a reversal of a certain word or selection of letters. Indicators for this include “turning,” “going back,” “around,” “about,” and “over,” and for down clues things like “rising” and “brought up” would also be acceptable. Be careful not to assume that a reversal indicator refers to all of the other parts of the clue; it may just refer to the word immediately preceding or following it, or somewhere in between.
Contrivance for catching animals, with portion turning (4) — as a clue for TRAP (contrivance for catching animals), which is PART (portion) the other way round
Return alcoholic drink of a monarch (5) — as a clue for REGAL (of a monarch), which is LAGER (alcoholic drink) the other way round