送 walks 辶 with hands offering something — delivery in character form. To send is to walk a thing (or a person) part of their way.
送 is generosity in motion: 送礼物 (give gifts — with rules: never clocks, never four of anything), 送朋友 (see a friend off — hosts walk guests to the door, the elevator, sometimes the street, negotiating 别送了! 'don't see me further!' the whole way), 外卖送到了 (the delivery arrived). Gift-giving etiquette and delivery apps both run on 送 — the character that never lets you leave empty-handed.
Walking 辶 something to someone — SEND, GIVE, SEE OFF.
Never 送 a clock: 送钟 sounds exactly like 送终 — attending a deathbed. Gift homophones are a minefield.