The term 'TRIM BACK, AS A TREE' can be solved by the crossword solution 'PRUNE', which is a five-letter word. Pruning is a horticultural practice that involves cutting away parts of a tree or shrub to improve its shape and structure. It is also used to remove dead or diseased branches, encourage new growth, and promote fruit production. Pruning is an important part of tree care and should be done regularly to ensure healthy growth.